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...t because that's what I used, but really any format is acceptable to me). ========================================================= 1) Unstable dev...() functions: I have the following line of code embedded in a function using simple "plot" commands and it works fine: if(!is.na(plotFileName)) dev.off() I set "plotFIleName" as "NA" by default, in which case the plot prints to screen. If a name is given, the print goes to the png() function. Therefore, I want to turn the device off to ensure that the next plot isn't sent to the same device & overwrites...

This may be asking too much, but I'm wondering if anyone has a solution (even a hack) for creating multiple (overlay) plots in an Sweave file and post-processing the overlays in beamer appropriately. For example, suppose I have a series of figure blocks in my .Rnw file: <<plot1,fig=TRUE>>= [stuff] @ <<plot2,fig=TRUE>>= [stuff] @ <<plot3,fig=TRUE>>=